Screening ball mill



Nov. 21, 1950 Filed May 8, 1945 F. M. CORNELL SCREENING BALL MILL 3 Sheets-Sheet 1 INVENTOR. FRANKLIN M CORNELL ATTORNEYS Nov. 21, 1950 F. M. CORNELL SCREENING BALL MILL 3 Sheets-Sheet 2 Filed May 8, 1945 IN VEN TOR. F RAN/(LIN M CORNELL A TTORNEVS Nov. 21, 1950 F. M. CORNELL 2,530,862

SCREENING BALL MILL Fil ed May a, 1945 3 Sheets-Sheet s vF .L 5

3o fi J F I F 1 iii-L- 30 INVENTOR. FRANKL/N M CORNELL A TTORNEVS Patented Nov. 21, 1950 UNITED STATES PATENT OFFICE SCREENING BALL MILL Franklin M. Cornell, Brooklyn, N. Y. Application May 8, 1945, Serial No. 592,622

. 3 Claims.

This invention relates to combined mills and strainers and is directed more particularly to a ball type mill in which a rotating drum is provided with'removable screens, and in which the material is fed into the drum via both ends of a hollow shaft on which the drum'is mounted. An object of the invention is the provision in a ball mill, of a, screen of a desired fineness positioned between coarser screens which serve to reinforce and protect the fine screen.

Another object of the invention is the provision in a ball mill, of a drum having removable arcuate walls which carry the screens, whereby screens which are used to work any color or character of material may be quickly removed, the supporting parts cleaned, and other walls carrying screens for other materials or colors may b quickly substituted therefor.

Yet another object of the invention is the pro vision in a ball mill of a drum including a solid wall having elongated apertures formed therein, a screen of one coarseness lying next to the interior of said wall, a second screen of the desired fineness lying against first said screen, and a third screen coarser than said second screen overlying the interior of the latter and adapted to withstand the weight of the balls and the material, and also the action of the balls upon the material being processed.

Yet another object of the invention is the provision in a combined ball mill and strainer, of a drum having walls comprised of removable arcuate sections which may be quickly attached to or detached from annular flanges formed on the heads of the drum.

. A further object of the invention is the provision in a ball mill, of a drum having end heads having annular flanges extending towards each other, said flanges carrying radial dowel pins,

and arcuate sidewalls carrying screens, said side walls having dowel holes in each end thereof adapted to engage said dowel pins, and means to secure said walls to said flanges.

Other objects and advantages of the invention will appear as the following specification and the accompanying drawings are studied.

Referring to the drawings which are given by way of example:

Figure 1 is an elevation partly in section, of my new and improved combined mill and strainer;

Figure 2 is an end elevation of the same;

Figure 3 is a view showing the circumferential walls of-the drum as formed of two halves;

Figure 4 is an end view of one of the heads of the. drum;

Figure 5 is an elevation of the head shown in Figure 4;

Figure 6 is an enlarged fragmentary view showing the engagement of one of the dowels by the arcuate wall of the drum;

Figure 7 is a sectional view showing the drum in rotation and the action of the hammer; and

Figure 8 is a fragmentary sectional view showing the two halves of the circumferential wall of the drum as having the exterior portion of the walls abutting each other and the screens overlapping the line of contact of the exterior walls.

Referring first to Fig. 1, the new and improved mill is generally designated by the numeral 19 and includes a shaft ll having an interior bore [2 formed therein. A series of radial holes I3 is formed in the shaft, and spaced apart therefrom is a second series of holes l4. A disc [5 is forced into the shaft with a press fit and is positioned between the sets of 'holes I3 and I4, thus dividing the interior ll into two divided chambers HR and ML. The shaft II is journaled in bearings l6 and I! which are provided with suitable oil cups l8 and I9 respectively. The bearings 16 and l i may be supported in any desired manner.

However, in the embodiment shown in Fig. 1, I show the bearings bolted to concrete bases 29 and 2| respectively. Mounted on the shaft ll, adjacent to the bearing I6, is a head 22, and an identical head 23 is mounted on the shaft ll adjacent to the bearing H. A suitable thrust washer 24 is provided between the hub 25 of the head 22 and the bearing l6, and a similar thrust washer 26 is provided between the hub 21 of the head-23 and the bearing H. The head 22 consists of a hub 25 having a hole formed therein to fit the shaft and secured to the shaft by means of set screws one of which is shown at 28. Continuous with the hub 25 is a circular web having an annular flange 29 formed integral therewith. The flange 29 is spaced inwardly from the outer periphery of the head so that the screws and other elements to be presently described will lie within the outer diameters of the heads 22 and 23. The flange 29 carries a series of radial dowel pins 30, as may best be seen in Figs. 4 and 5. The annular flange 29 also has threaded holes 3|, 32 spaced apart from each other. Diametrically opposite the threaded holes 3|, 32 are threaded holes 33, 34. The head 23 is identical with the head 22, so like parts on the head 23 will be designated by the same numeral with the addition of small a; for example, the annular flange 29 is designated on the head 23 as 29a, and. the dowels on the head 23. are designated as 30c,

The circular walls of my new and improved ball mill are formed in identical halves which, when mounted on the heads 22 and 23, form a continuous circular wall. Although the two half Walls are identical they are designated as may best be seen in Fig. 3, by the numeral for the upper half and 36 for the lower half. Each half consists of a semi-circular wall having a plurality of elongated slots 3'! formed therein with webs 31a formed therebetween. Inside of and extending from end to end of the member 35 is a screen 38 which is preferably of a larger mesh than the fine screen to be presently described and consequently this screen 38 is formed of heavy wires which impart strength to the structure. Since the screen 38 extends from end to end inside the member 35, it is obvious that the screen covers all of the apertures 31 formed in the wall of the member 35. Lying next to the screen 38, the mesh of which is of a desired fineness, is a screen 39. Lying next to the screen 39 a coarser screen 40 which has sufficient strength and body toyproperly supportboth the balls and the material being worked.

As may be seen in .Fig. 8, the edges of the screens 38,39, and 40, terminate on a line III, which is spaced apart from the trailing edge 35a of the outer wall .35.

"The outer wall 36 carries screens 38a, 39a, and 4001., which overhang the leading edge (abutting the trailing edgei35a) of the wall 36 and abutting the ends .of thescreens 38, 39, and 40. vDiametrically opposite the arrangement .is exactly the same so that when the two half walls are secured to the heads thereis no leakage along the lines where the outer walls35 and 36 abut each other. Eachhalf wall 35 and 36 is provided with a-series ofelongated holes 42, and round holes 43 adjacent'to theleadingand trailing edges of the half walls 35 and 36. In applying the half walls 35 and 36 to the heads 2.2 and 23 one of them, say the wall .35, is positionedpon the flanges of theheads with the dowels .39 and 30a engaging the dowel holes 42 and as the inner screen 40 comesin contact withthe-fianges .29 and 29a (as shown in Fig. 6) theholes 43 are. aligned with the tapped holes .3I, :34 the flanges and the half wall is'then'secured tothe heads by means .of cap scr.ews;two ofwhich are shown .atM, in'Fig. l. The second half wall :36 may beapplied .togthe flanges in the same manner as described above vandit may also be secured to the flanges by means of. cap screws. engaging the tapped holes-32, 33. From the above description it willbe evident that the half wallsmay be applied to or removed 4 from'the heads both easily and rapidly.

Referring again to Fig. l, the shaft I Ihas fixed thereto-a pulley 45 which maybe belted to a motor or other prime mover, suitable clearance. 46 being provided for the pulley and the belt. The concrete base has a portion 2011. upon which a special receptacle 4'! is mounted. The receptacle has an open end-48 at the top thereof and has an annular boss 49 counterbored at 50 to receive the end IIa of the shaft. The wall of'the reeeptaclealso has a hole 5i concentric with the hole 50 which provides communication between the interior of the receptacle and the interior I2 of the shaft II. The base 2-I has a portion 2la which supports a receptacle 410. which is identi cal with the receptacle 41. Thereceptacles J41 anddlaare secured to the bases 20a and 2 la respectively by means of cap screws 52 engaging threaded inserts (not shown) in the-bases=20a and Zla so that when'the cap screws-52 are removed the receptacles may be disengaged from the shaft II by moving them endwlse. As the receptacles are moved endwise, the counterbores 50 in the annular bosses 49 become disengaged from the shaft and when the end of the boss 49 clears the end of the screw conveyor positioned in the shaft, the receptacle may be completely removed from its pedestal (28 or 2Ia). In replacing the receptacles, they are moved end- .wise until the end of the shaft engages the counterbore 50, following which the cap screws 52 are then caused to re-engage the threaded inserts above referred to. Obviously, the clearance holes in the flanges on these receptacles are larger than the diameter of the cap screws and the operator must make sure that the receptacles are not cocked so as to bind the shaft when the cap screws 52 are tightened down.

Positioned within and having its outer periphery frictionally engaging the hollow interior III; of th h s a rew o ey .5 wh consists of a small shaft 53 about which a heliel Web is d s d h h l a we terminot s a a :p i spaced a ar om the u o barr r I so s to form a hamb adjacen to the holes I3 formed in the shaft II. The left en o t e screw on y r ermi a es in t o t m. o th ece t c 41 so t a s thesha t I I rotates the material 56 is fed to the right and is delivered to the chamber 55 within the shaft so that it may fall therefrom v a the holes I3 and into the interior of the mill.

Th ute e s o h helica web 54 ic: on y en a e t n e io a s o e shaft su f cien to caus the ew con yor to posi: ve y rotate as thesha t is rotatin W e t e receptacle 4] is removed as above described, the left hand of the screw conveyor may be grasped and the conveyor maybe bodily emoved from the hollow interior IIR of the shaft. This en,- ables every part of the mill withwhich the mater al bei g w rked com s n contact. to be cl aned.

Asimilar screw conveyor generally designated y the numeral .5 i moun d in-the hollow in.- terior .I ILof the shaft I I andthis screw conveyor isidentical withthe screw conveyor above described except that the helical ;web is disposed on the central shaft 53cm an opposite direction so that the material from the receptaclefila will be fedto the leftso as todeliver material to the chamber 55a.

Positioned between the supports ;20 andZl is a suitable receptacle58 for. receiving the finished product.

-l\ /lio un ted on someof the webs-.Mwisa series of lugs .59.w,hi.ch cam-against a pipe, rod or other hammer,:,60 as thedrum is rotated in the direc- ,tion shown. by thearrowinFig. 7. The: hammer 6.0 may consist of a length .of .pipe .which is screwed into a T "GI. The'T maybe mounted-on a cross rod 62 .throughwhich cotter pins (not shown) or any other suitable meansmay be pro-,- vided for preventing the T from movingendwise on the crossrod I52.

e e ioo As an example of the use of my-newand improved ball'mill, a charge of twenty to twentyfive-pounds of balls may be placed in the mill and the mill may be filledabout one-third: full: of methylorangethen the-mill may be' closed-by securing the second'half wall tothe flanges by means of cap screws 44. Following this the hammer is positioned to be contacted bytlie' lugs assosea 59 and the mill is started up. The hammer makes, according to the speed the drum is driven, twelve to twenty-five strokes or pulses per second. One charge of approximately one-hundred fifty pounds of methylorange dye may be processed in twenty to forty-five minutes depending upon the humidity of the atmosphere. Suppose it is desired to follow the orange dye with another color. I may remove the receptacles 41 and 41a, then withdraw the screw conveyors and clean them off, clean out the hollow interior HR and ML of the shaft and substitute other half screens for the half screens and 36, replace the screw conveyors and the receptacles 41 and 41a, and thus change to another color or another material within a minimum of time.

From the above it will be seen that my new and improved mill has the following advantages. It may be opened or closed by handling a maximum of eight bolts; it may be ver easily cleaned, it is very easy to change to screens of different degrees of fineness, it is very easy to change screens to handle different products or colors, and repairs may be effected very easily due to the complete accessibility of every part of the device.

Although I have herein shown and described by way of example one embodiment of my new and improved ball mill, it is obvious that many changes ma be made in the arrangements herein shown and described without departing from the spirit of the invention as set forth in the following claims.

What is claimed is:

1. In a ball mill, a drum having heads with annular flanges formed integral therewith and extending toward each other, a hollow shaft supporting said heads in spaced relation and having apertures a series of radial holes formed therein communicating with the interior thereof and the interior of said drum between said flanges, a plurality of radial dowels carried on said annular flanges, a plurality of removable curved wall sections having dowel holes formed therein for cooperating with said dowel pins, other holes formed in said sections through which securing means may pass to engage said flanges, said wall sections carrying screens, bearings supporting said shaft, a material receptacle positioned on at least one end of said shaft and having an opening formed therein through which material may be delivered to the hollow interior of said shaft, means in said hollow interior for 'urging said material toward said apertures, a rod or hammer extending across the top of said drum, and lugs carried on said wall sections in a path to repetitively raise and drop said hammer.

2. In a ball mill, a drum carrying screens, a shaft supporting said drum, bearings for said shaft, said shaft having a hollow interior bore, a barrier positioned in said bore substantially intermediate the ends of said drum, a series of radial holes in said shaft to one side of said barrier, said holes communicating with said hollow interior and the interior of said drum, another series of radial holes formed in said shaft to the other side of said barrier and communicating with both the interior of said drum and said hollow interior, a removable right hand screw conveyor positioned in the hollow interior of said shaft to one side of said barrier and extending beyond the end of said shaft, a second removable left hand screw conveyor positioned in the hollow interior of said shaft to the other side of said barrier and extending beyond the other end of said shaft, material receptacles positioned at each end of said shaft and having counterbores therein through which the extended portions of the respective screw conveyors may extend, both said screw conveyors being adapted to deliver material from said receptacles to the interior of said drum via said radial holes.

3. In a ball mill, a shaft, bearings for said shaft, a pair of heads carried on said shaft in spaced relation to each other and having annular flanges formed integral therewith and extending toward each other, a pair of walls of semi-circular cross-section demountably secured to said flanges thereby forming a drum, said walls each including a screen of a predetermined fineness sandwiched between coarser screens which serve to reinforce and protect said fine screens, said screens also being stepped at the edges where said walls joint one another, said shaft having a hollow interior bore, a barrier positioned in said bore substantially intermediate the planes of said heads, radial holes formed in said shaft to one side of said barrier and communicating with both the interior of said drum and said bore, other radial holes formed in said shaft on the other side of said barrier and communicating with both the interior of said drum and said hollow interior, a removable right hand screw conveyor positioned in the hollow interior of said shaft on one side of said barrier and extending beyond the end of said shaft, a second removable left hand screw conveyor positioned in the hollow interior of said shaft to the other side of said barrier and extending beyond the other end of said shaft, material receptacles positioned at each end of said shaft and having counterbores therein through which the extended portions of the respective screw conveyors may extend, both said screw conveyors being adapted to deliver material from said receptacles to the interior of said drum via said openings.

FRANKLIN M. CORNELL.

REFERENCES CITED The following references are of record in the file of this patent:

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